Screw-thread-cutting tool



(No Model.)

J. GUEDEL.

SCREW THREAD CUTTING TooL.

No. 326,733. Patented Sept. 22, 1885.

E me .Agar/1m N PETERS. PMm-Uxhognpner. walhingmn, D,C.

UNITED STATES ATnNT Trios.

JOHN GUEDEL, OF CANAL DOVER, OHIO.'

SPECIFICATION forming part of Letters Patent No. 326,733, dated September 22, 1885.

Application led May 2l, 1885.

To all whom it may concern:

Be it known that l, JOHN GUEDEL, a citizen of the United States, residing at Canal Dover, in the county of Tuscarawas and State of Ohio, have invented a new and useful Improvement in Serew-Thread-Cutting Tools, of which the followingis aspeciiieation, reference being had to the accompanying drawings.

My invention relates to improvements in screw-thread cutters; and it consists in the improved construction and combinations of devices that will be more fully described hereinafter, and particularly pointed out in the claims.

In the drawings, Figure lis aside elevation.

Fig. 2 is a view taken at right angles to Fig. l. Figs. 3 and 4 are detail views.

A represents a spindle or shank, which has one end reduced, as at D, and adapted to tin an ordinary bit-stock, and is provided with a screw-thread, C, which extends for a suitable distance along the spindle. Formed with the spindle, at one end thereof, is a rigid jaw, D, and to this spindle, at the point E, is pivoted a jaw, F. Aspring, G, bears between the jaws and serves to keep them normally open.

H I represent thu lub-nuts, which work 011 the threaded portion ofthe spindle, and in between these thumb-nuts on the spindle slides a collar, K, which is provided with lugs L on opposite sides. To these lugs are fulerumed hand-levers M. The forward ends of the jaws D and F are formed into enlarged heads, as shown, and from these heads to the reduced port-ions of thejaws are inclines N.

O represents a co1lar,whieh is beveled onits inner side and adapted to fit the inclines N, andis provided on its rear side with rearwardly-eXtending lugs P, to which are fulerumed levers R,which are also connected tothelevers M. It will be seen by this construction that the levers M and It form toggles, which are adapted to move the ring O back and forth upon the inclines N by opening` or closing the levers M, and thereby cause the pivoted jaw F to approach or recede from the rigid jaw D. In the ends of the heads of the jaws are cut dovetailed mortises or grooves S, in the faces of which are made rectangular recessed grooves T.

U represents dies for cutting threads, which are inserted into the dovetailed mortises, and

(No model.)

are provided on their under sides with ribs V, which enter the grooves T. Set-screws W bear against the dies and secure them iirmly in place, and allow them to be readily removed from the heads when desired. Set-screws X extend through the heads at right angles to the screws W, and the inner ends of the screws X are adapted to bear against the opposing faces or inner sides ofthe jaws. These screws X serve to regulate the play of the jaws and prevent them from coming too close together. The dies U are removable, so that they may be replaced by4 others adapted for cutting coarser or iiner threads upon bolts of different diameters.

The operation of my invention isas follows: After the dies have been secured in the heads the setvsorews X are adjusted so as to enable thejaws to come together to the required eX- tent, and the collar K is moved on the spindle by turning the thumb-nuts Hand I far enough to cause the collar O to clamp the dies together upon the bolt or rod upon which the thread is being cut by opening the outer ends of the levers M. By inserting the end B in a bitstock a rotary motion can be imparted to the thread-cutter, as will be very readily understood, and thereby cause it to readily eut the threads. The screws V not only enable the dies to be removed from the heads of the jaws, but also enable them to be adjusted closer together in order to compensate for wear on the die, and thus permit the latter to be recut after having become dull or worn, and thus enable the dies to be used for a very great length of time.

Having thus described my invention, I claim-- l. The combination of a rigid jaw and apivoted jaw having the dovetailed mortises in their enlarged heads with the thread-eutting dies U, inserted in the mortises7 the set-screws for clamping the dies in the mortises, the setscrews X, for regulating the movement of the jaws, and means for clamping the jaws together, substantially described.

2. The combination of the spindle having the rigid jaw and the pivoted jaw, thethreadcutting dies secured in the heads of the jaws, said jaws being provided with the incline N,

the levers M, fulcrumed to the spindle, the collar O, working on the inclines N, and the 'levers R, connecting the collar O with the leet. The combination, with the pivoted jaw andthe rigid j aW having the dovetailed grooves 1 5 S, provided with recesses T, of thethread-outting dies U, having the ribs V' engaging with recesses T, and set-screws for clamping the dies in place, substantially as described.

In testimony that I claim the foregoing as 2o my own I have hereto affixed my signature in presence of two Witnesses.

JOHN GUEDEL.

Witnesses:

JOSEPH H. HosTE'rLER, JOHN A. HosTETLER. 

